US3994067A - Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine - Google Patents
Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine Download PDFInfo
- Publication number
- US3994067A US3994067A US05/540,096 US54009675A US3994067A US 3994067 A US3994067 A US 3994067A US 54009675 A US54009675 A US 54009675A US 3994067 A US3994067 A US 3994067A
- Authority
- US
- United States
- Prior art keywords
- air
- carburetor
- shroud
- crankshaft
- entrained
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/022—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B17/00—Chain saws; Equipment therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
- F02M35/06—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices combined or associated with engine's cooling blower or fan, or with flywheel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B2075/1804—Number of cylinders
- F02B2075/1808—Number of cylinders two
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/707—By endless band or chain knife
Definitions
- This invention relates to a method and apparatus for removing particulate matter from the intake air of a chain saw internal combustion engine.
- the working environment for portable chain saws may range from logging camps to a homeowner's backyard. Almost universally, however, where portable chain saws possess a degree of utility, a common environmental denominator is the notable presence of dust, dirt and debris which is kicked up during a cutting operation.
- air suspended debris or temporary atmospheric impurities may range from coarse matter such as relatively large sticks and leaves to very fine dust particles which may be as small as one micron in diameter. Since air suspended debris surrounds the operating saw it is highly subject to being sucked into the carburetor and the operating cycle of the internal combustion engine.
- the Mansfield patent discloses an apparatus for supplying air to the carburetor of an internal combustion engine which utilizes, in combination with an intake screen, a rotary fan of the centrifugal type. The fan serves to impel air and entrained matter radially away from a crankshaft and out through a surrounding shroud. Intake air to the carburetor is drawn from within the shroud at a position behind a baffle positioned to separate the fan from an aperture in the shroud.
- An apparatus intended to accomplish at least some of the foregoing objects comprises a chain saw internal combustion engine wherein the engine includes at least one piston and cylinder, a crankshaft and a carburetor.
- a shroud surrounds at least one end of the crankshaft and includes an air inlet fashioned into the shroud adjacent one end of the crankshaft and an air outlet fashioned into the shroud remotely from the air inlet.
- a passage is connected into the shroud at a position adjacent to the one end of the crankshaft and is in fluid communication with the carburetor of the internal combustion engine.
- a first centrifugal means is connected to the one end of the crankshaft, between the air inlet and the passage opening, for drawing air into the shroud and impelling the air and entrained particulate matter away from the crankshaft through the shroud and out of the air outlet.
- a second centrifugal means is also connected to the one end of the crankshaft, between the first centrifugal means and the passage, for centrifugally impelling air and entrained matter away from the crankshaft, through the shroud and out of the air outlet.
- a method aspect of the invention comprises drawing air into the shroud surrounding the one end of the crankshaft, centrifugally impelling the air and at least a portion of any entrained matter radially away from the crankshaft through the shroud and out of the air outlet, drawing air through the passage connected into the shroud adjacent the crankshaft and into the internal combustion engine carburetor and centrifugally impelling air and at least a further portion of any entrained matter away from the passage opening, so that matter entrained within the inlet air will be substantially removed prior to the inlet air entering the carburetor.
- FIG. 1 is a pictorial illustration of a chain saw, including an internal combustion engine having an air intake system comprising the subject matter of the instant invention
- FIG. 2 is a cross-sectional view taken along section line 2--2 in FIG. 1 and discloses, by directional arrows, the general flow pattern taken by inlet air as the air is drawn into a shroud surrounding the air cooled internal combustion engine of the chain saw;
- FIG. 3 is a cross sectional view taken along section line 3--3 in FIG. 1 and further discloses, by the provision of directional arrows, the general flow path exhibited by air which is drawn into the shroud surrounding the chain saw internal combustion engine;
- FIG. 4 is a side elevational view, partially broken away, which further discloses the intake air flow characteristics through the shroud of the portable chain saw including the flow of air into an accumulation chamber, through a diaphragm fiter and into the carburetor of the chain saw internal combustion engine;
- FIG. 5 is a plan view of a first centrifugal means, including a hub and a cascade of radial flow compressor blades, which is positioned adjacent to the inlet of the shroud surrounding the internal combustion engine;
- FIG. 6 is a plan view of a second centrifugal means comprising the opposite side of the hub disclosed in FIG. 5 and includes a cascade of radial flow compressor blades, which is positioned adjacent to the inlet of the air passage interconnecting the shroud and the carburetor; and
- FIG. 7 is a schematic representation of a succession of particulate material removal steps that are provided by the subject intake air handling system for a chain saw internal combustion engine.
- FIG. 1 there will be seen an illustration of a portable chain saw 10 including a portable power drive system 12, a guide bar 14 connected thereto, and an endless cutting chain 16 entrained around the guide bar.
- a centrifugal clutch system (not shown) is interposed between a crankshaft of the power drive 12 and a sprocket gear meshed with the cutting chain for providing selective R.P.M. controlled drive to the cutting chain.
- the portable power drive 12 includes a frame and grip assembly 18 which is fixedly attached to a housing 20 of an air cooled internal combustion engine and operatively serves as one location for an operator to grasp and manipulate the chain saw.
- a control handle 22 Remotely positioned with respect to the guide bar 14 is a control handle 22.
- the control handle is directly attached at the upper end thereof to a frame portion of the power drive assembly 12 and at the lower end thereof to a skid arm 24. An operator therefore may grasp the handle 22 and actuate a trigger throttle control 26 to provide controlled cutting actuation of the chain 16.
- the upper portion of the portable power drive 12 is provided at a section rear thereof with a fuel tank 28 and at a fore section thereof with an accumulation chamber 30 to be described in detail hereinafter.
- FIGS. 2 and 3 there will be seen cross-sectional views which disclose the internal construction of the portable power drive 12.
- an air cooled internal combustion engine 32 is illustrated including a combustion cylinder 34 provided with a plurality of circmferentially disposed radially extending cooling vanes 36.
- a piston 38 is mounted for reciprocation within the cylinder in a conventional manner and is connected through a connecting arm 40 to a crank arm 42.
- a balancing piston 44 may be provided, which operates 180° out of phase with the power piston 38.
- the balancing piston 44 may be connected to a crank arm 46.
- a crankshaft 48 connects crank arms 42 and 46 and extends at one end 50 through a conventional ball bearing mounting 52 in the crank case 54 to a centrifugal clutch 55.
- the centrifugal clutch operatively connects the crankshaft 48 within a cutting chain sprocket 56.
- the other end 57 of the crankshaft 48 extends through the opposite side of the crank case 54 via a conventional ball bearing mounting 58 to a position adjacent a hand operated recoil starter 60.
- the recoil starter serves in a conventional capacity to crank the engine during a starting operation.
- an air shroud 70 which surrounds the one end 57 of the crankshaft adjacent to the starter 60.
- the shroud 70 extends around and surrounds the internal combustion engine cylinder 34.
- An air inlet opening 72 is fashioned into the shroud at a location adjacent to one end 57 of the crankshaft and an air outlet 74 is positioned remotely from the inlet 72 on an opposite side of the cylinder 34.
- air outlet 74 is positioned remotely from the inlet 72 on an opposite side of the cylinder 34.
- a frustoconical shaped slitted screen 76 is positioned between the shroud 70 and the casing of the starter 60, note FIG. 4.
- the slitted screen 76 provides a first echelon in a system designed to remove particulate matter entrained within the inlet air of the internal combustion engine.
- a first cascade 80 or radial flow compressor blades 82 In order, however, to further remove particulate matter entrained within the inlet air, one end 57 of the crankshaft 48 is provided with a first cascade 80 or radial flow compressor blades 82.
- the blades 82 are mounted upon an outwardly extending surface 83 of a hub 84. Surface 83 as noted in FIG. 2 faces the air inlet opening 72.
- centrifugal compressor blades 82 as viewed in FIG. 5, are cambered in cross-section for smooth flow characteristics and also are provided with a nonradial leading edge angle -37 A" which increases the efficiency of the blade cascade.
- the cascade 80 of radial flow compressor blades serves to draw inlet air through the coarse screen 76 into the shroud 70 in a manner depicted by flow arrows 86 in FIGS. 2 and 3.
- a chain saw operational environment typically includes a significant amount of particulate matter entrained within the air, such as dirt particles and fine saw dust. This matter will readily pass through the coarse screen 76 and be sucked into the shroud 70 along with the intake air.
- the centrifugal vanes 82 serve to impart a high velocity to these particles in a direction radially away from the one end 57 of the crankshaft axis.
- the shroud 70 is provided with an interior portion 89 which extends adjacent to the one end 57 of the crankshaft 48.
- a passage 90 is fashioned through the interior portion 89 of the shroud at a location adjacent to the one end 57 of the crankshaft. Passage 90 ultimately leads into a carburetor 92 which feeds into the internal combustion engine, note FIG. 4.
- Air having a relative mass which is less than that of entrained dust particles will tend to be sucked around the outer edge of the hub 84, in a flow pattern as depicted by directional arrows 94, through the passage 90, as depicted by directional arrows 96, and utlimately into the carburetor 92.
- Very fine dust particles, however, having a lower radial momentum, attributable to the relatively smaller mass thereof as compared with larger coarse particles may also bend around the hub edge in a flow pattern similar to that depicted by arrows 94 and thus will tend to enter the passage 94 adjacent the crankshaft.
- a third debris removal echelon is provided to minimize the possibility of this finer particulate matter entering the carburetor.
- the back side 98 of the hub 84 is provided with a cascade 100 of radial flow compressor vanes 102.
- the compressor vanes 102 as best illustrated in FIG. 6, have a nonradial trailing edge angle B and are linear in cross section. Air and fine entrained impurities which tend to be sucked radially between the interior shroud portion 89 and the back side 98 of the hub 84 are slowed up and eddy currents depicted by circular phantom lines 104 may be formed, note FIGS. 2 and 3.
- the combination of the impurities and air is provided with a radially outwardly directed momentum by the provision of the second cascade 100 of compressor blades 102. Because the mass of the entrained particulate matter is greater than that of the air, the radial outward momentum of the fine dust particles is greater than that of the air and thus additional fine dust particles are radially impelled into the main flow stream and through the shroud 70, as indicated by directional flow arrows 106, while the air may be drawn into passage 90.
- a fourth echelon of particulate matter removal is provided by an accumulation chamber filtration system as illustrated in FIGS. 3 and 4.
- an accumulation chamber 30 is positioned within the passage 90, between the passage inlet 103 and the carburetor 92.
- the accumulation chamber 30, defined by a cover 31, is provided with a filter diaphragm 112 which is constructed with a window 114 to permit air to enter the chamber from passage 90 in a position above the filter as indicated by flow arrows 110.
- a second accumulation chamber 116 Positioned beneath the filter diaphragm 112 is a second accumulation chamber 116 which opens into carburetor 92.
- air which is drawn through passage 90 is able to expand into the accumulation chamber 30, reverse the direction of flow thereof and seep through filter 112 into chamber 116 and ultimately the carburetor 92.
- This fourth echelon of particulate matter removal is capable of removing very fine dust particles that previously would have entered the carburetor and the combustion cycle.
- filter 112 may be designed for very fine filtration without becoming rapidly clogged. In the event, however, that it is desirable to service the filter 112 after a substantial period of use, the cover 31 may be readily removed by removing a centrally positioned conventional mechanical fastener 118.
- FIG. 7 there will be seen in a schematic sequential array the steps of removing particulate matter that may be entrained within the intake air prior to delivery of the intake air into the carburetor of a chain saw internal combustion engine.
- the initial particulate removal step (not illustrated) is provided by the coarse frustoconical screen 76 which filters out relatively large objects such as leaves, wood chips, etc. thus permitting air and the entrained finer particles to enter into the shroud 70 as depited by flow arrows 86.
- air is drawn into the shroud 70 by suction produced by the compressor blades 82 which are mounted upon hub 84.
- the blades 82 are of the radial flow compression type such that air will be sucked axially toward the hub 84 and radially impelled outwardly from the hub axis toward the shroud 70. The air and entrained matter will leave the blades 82 at approximately the same velocity. However, because dirt and saw dust particles have a greater mass than that of air, such particles will have a greater radial momentum and will thus tend to flow in the direction of arrow 120 and impinge upon the inner surface of the shroud 70 as indicated at 122. In practice it has been found that the shroud 70 is continually cleansed by the high volume of flow passing through the shroud and such large dust particles are vented out from the shroud through the outlet 74 as previously mentioned.
- the inlet air has now passed through three echelons of particulate matter removal and only very fine matter remains suspended within the air passing through passage 90.
- This air upon entering accumulation chamber 30 encounters a flow reversal indicated by arrows 110 and a decrease in velocity as previously discussed.
- the air seeps through filter 112 where very fine dust particles 132 are effectively removed.
- the thus cleansed air is then drawn into the carburetor 92 without producing the deleterious effects heretofore encountered in portable chain saw systems.
- the above illustratively described invention provides a novel method and apparatus for removing paticulate material from the intake air of a chain saw internal combustion engine without using a conventional inlet filter.
- the subject filtering system significantly provides sequential filtering stages, thus possessing the capability of filtering a wide size range of particulate matter from the inlet air while maintaining a sufficient volume of air flow so as not to disturb the optimum fuel to air ratio of the internal combustion engine cycle.
- novel method and apparatus of the subject invention provides a compact highly efficient synergistic relationship of elements which perform a multiplicity of functions to enable the equipment to be compact and easily portable.
- the subject invention advantageously utilizes two cascades of radial flow compressor blades, attached to a hub which also serves as a flywheel for the engine, to blow cooling air over the chain saw engine while simultaneously removing entrained impurities from the inlet air of the engine.
- Each cascade of blades is individually and uniquely formulated for maximum combinational performance.
- the subject air treatment system further includes a coarse frustoconical inlet screen which is suitable to remove relatively large air entrained matter which would be capable of rapidly clogging fine air cleansing means. Still further the subject invention provides a unique accumulation chamber which combines air flow velocity reduction and flow reversal with a fine gauge diaphragm filter to remove very fine particulate matter which heretofore frequently had entered the carburetor and combustion cycle of chain saw engines.
Abstract
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US05/540,096 US3994067A (en) | 1972-11-14 | 1975-01-10 | Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US30619572A | 1972-11-14 | 1972-11-14 | |
US05/540,096 US3994067A (en) | 1972-11-14 | 1975-01-10 | Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US30619572A Continuation | 1972-11-14 | 1972-11-14 |
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US3994067A true US3994067A (en) | 1976-11-30 |
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US05/540,096 Expired - Lifetime US3994067A (en) | 1972-11-14 | 1975-01-10 | Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine |
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Cited By (61)
Publication number | Priority date | Publication date | Assignee | Title |
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US4178685A (en) * | 1977-07-29 | 1979-12-18 | Kioritz Corporation | Chain saw |
DE2929965A1 (en) * | 1978-07-31 | 1980-02-21 | Nat Union Electric Corp | IC engine driven portable chain saw - has cooling fan feeding air into exhaust gas mixing chamber before exhaust reaches outlet |
DE2939650A1 (en) * | 1978-10-03 | 1980-04-17 | Textron Inc | COMBUSTION ENGINE |
US4222360A (en) * | 1976-07-19 | 1980-09-16 | Kawasaki Jukogyo Kabushiki Kaisha | Internal combustion engine having engine cover |
DE2911497A1 (en) * | 1979-03-23 | 1980-09-25 | Stihl Maschf Andreas | CHAINSAW |
US4285309A (en) * | 1979-11-13 | 1981-08-25 | Jonsereds Aktiebolag | Housing for an internal combustion engine |
JPS6036538U (en) * | 1983-08-18 | 1985-03-13 | ヤマハ発動機株式会社 | forced air cooled engine |
DE3432485A1 (en) * | 1983-09-09 | 1985-03-28 | Kioritz Corp., Mitaka, Tokio/Tokyo | MUFFLER FILTER |
US4592445A (en) * | 1984-09-26 | 1986-06-03 | Komatsu Zenoah Co. | Suction device for chain saw |
US4632070A (en) * | 1984-12-19 | 1986-12-30 | Honda Giken Kogyo Kabushiki Kaisha | Device for cooling engine power unit |
FR2592096A1 (en) * | 1985-12-24 | 1987-06-26 | Stihl Andreas | AIR FILTER FOR A MOTOR APPARATUS |
DE3708289A1 (en) * | 1986-03-14 | 1987-09-17 | Electrolux Ab | ARRANGEMENT IN AN AIR COOLED COMBUSTION ENGINE |
US4727651A (en) * | 1985-01-08 | 1988-03-01 | Komatsu Zenoah Co. | Chain saw |
US4838908A (en) * | 1988-07-27 | 1989-06-13 | Kohler Co. | Engine air intake screen assembly |
DE3916414A1 (en) * | 1988-06-10 | 1989-12-14 | Kioritz Corp | PORTABLE MOTORIZED WORKING MACHINE |
US4893407A (en) * | 1989-05-30 | 1990-01-16 | Blount, Inc. | Integral dust cover and pump drive |
US4979306A (en) * | 1989-01-17 | 1990-12-25 | Kioritz Corporation | Power working machine |
US5029393A (en) * | 1989-04-15 | 1991-07-09 | Kioritz Corporation | Chain saw |
US5167209A (en) * | 1992-03-05 | 1992-12-01 | Dufern Richard L | Engine filter assembly |
US5231956A (en) * | 1992-02-11 | 1993-08-03 | Andreas Stihl | Portable handheld work apparatus |
DE4319503A1 (en) * | 1992-06-26 | 1994-01-05 | Kioritz Corp | Induction inlet for IC engine - has aperture pointing in opposite direction to flow of cooling air produced by cooling blower. |
US5285751A (en) * | 1993-07-28 | 1994-02-15 | Kohler Co. | Engine air intake screen assembly |
US5367988A (en) * | 1993-09-01 | 1994-11-29 | Wci-Outdoor Products, Inc. | Dynamic air cleaner and carburetor pressurization system for air cooled internal combustion engines |
US5522355A (en) * | 1993-12-31 | 1996-06-04 | Andreas Stihl | Hand-held tool device, especially motor chain saw |
US5542380A (en) * | 1995-03-28 | 1996-08-06 | Wci Outdoor Products, Inc. | Integrated dynamic air cleaner |
FR2748520A1 (en) * | 1996-05-09 | 1997-11-14 | Stihl Andreas | PORTABLE TOOL MACHINE COMPRISING AN INTERNAL COMBUSTION ENGINE |
US5687689A (en) * | 1996-10-15 | 1997-11-18 | Santos; Eligio | Air cooled engine screen and method |
US5720243A (en) * | 1996-01-12 | 1998-02-24 | Aktiebolaget Electrolux | Device for separation of dust |
FR2771772A1 (en) | 1997-11-28 | 1999-06-04 | Stihl Maschf Andreas | WORKING INSTRUMENT WITH HAND HELD MOTOR AND MANUALLY GUIDED |
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US20090000130A1 (en) * | 2006-01-13 | 2009-01-01 | Husqvarn Zenoah Co., Ltd. | Chain Saw |
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US20110072671A1 (en) * | 2008-05-23 | 2011-03-31 | Hitachi Koki Co., Ltd., | Chain saw |
US8393048B2 (en) | 2009-04-22 | 2013-03-12 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning two filters of a suction device for cleaning purposes and suction device for performing the method |
US8419834B2 (en) | 2005-10-12 | 2013-04-16 | Kohler Co. | Air cleaner assembly |
US8474093B2 (en) | 2009-07-07 | 2013-07-02 | Alfred Kaercher Gmbh & Co. Kg | Suction appliance for cleaning purposes |
US8510904B2 (en) | 2009-04-30 | 2013-08-20 | Alfred Kaercher Gmbh & Co. Kg | Suction cleaning apparatus |
CN103306797A (en) * | 2012-03-15 | 2013-09-18 | 日立工机株式会社 | Engine power tool |
JP2013189948A (en) * | 2012-03-15 | 2013-09-26 | Hitachi Koki Co Ltd | Engine and engine working machine |
US20170259452A1 (en) * | 2016-03-10 | 2017-09-14 | Makita Corporation | Chainsaw |
GB2551427A (en) * | 2016-04-26 | 2017-12-20 | Makita Corp | Air filter device for filtering the intake air of a combustion engine, in particular for a hand-held small tool |
DE102009009239B4 (en) * | 2008-03-18 | 2018-01-11 | Dolmar Gmbh | Device for cleaning intake air |
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US4222360A (en) * | 1976-07-19 | 1980-09-16 | Kawasaki Jukogyo Kabushiki Kaisha | Internal combustion engine having engine cover |
US4178685A (en) * | 1977-07-29 | 1979-12-18 | Kioritz Corporation | Chain saw |
DE2929965A1 (en) * | 1978-07-31 | 1980-02-21 | Nat Union Electric Corp | IC engine driven portable chain saw - has cooling fan feeding air into exhaust gas mixing chamber before exhaust reaches outlet |
DE2939650A1 (en) * | 1978-10-03 | 1980-04-17 | Textron Inc | COMBUSTION ENGINE |
FR2438171A1 (en) * | 1978-10-03 | 1980-04-30 | Textron Inc | INTERNAL COMBUSTION ENGINE |
US4261302A (en) * | 1978-10-03 | 1981-04-14 | Textron, Inc. | Air cleaning system of internal combustion engine |
DE2911497A1 (en) * | 1979-03-23 | 1980-09-25 | Stihl Maschf Andreas | CHAINSAW |
US4285309A (en) * | 1979-11-13 | 1981-08-25 | Jonsereds Aktiebolag | Housing for an internal combustion engine |
JPH0210253Y2 (en) * | 1983-08-18 | 1990-03-14 | ||
JPS6036538U (en) * | 1983-08-18 | 1985-03-13 | ヤマハ発動機株式会社 | forced air cooled engine |
DE3432485A1 (en) * | 1983-09-09 | 1985-03-28 | Kioritz Corp., Mitaka, Tokio/Tokyo | MUFFLER FILTER |
US4681608A (en) * | 1983-09-09 | 1987-07-21 | Kioritz Corporation | Silencing filter |
US4592445A (en) * | 1984-09-26 | 1986-06-03 | Komatsu Zenoah Co. | Suction device for chain saw |
US4632070A (en) * | 1984-12-19 | 1986-12-30 | Honda Giken Kogyo Kabushiki Kaisha | Device for cooling engine power unit |
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FR2592096A1 (en) * | 1985-12-24 | 1987-06-26 | Stihl Andreas | AIR FILTER FOR A MOTOR APPARATUS |
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US4841920A (en) * | 1986-03-14 | 1989-06-27 | Aktiebolaget Electrolux | Arrangement in an air-cooled I. C. engine |
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US4838908A (en) * | 1988-07-27 | 1989-06-13 | Kohler Co. | Engine air intake screen assembly |
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US5522355A (en) * | 1993-12-31 | 1996-06-04 | Andreas Stihl | Hand-held tool device, especially motor chain saw |
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US5720243A (en) * | 1996-01-12 | 1998-02-24 | Aktiebolaget Electrolux | Device for separation of dust |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: MCCULLOCH CORPORATION A MD CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BLACK & DECKER INC., A DE CORP.;REEL/FRAME:004134/0336 Effective date: 19830505 |
|
AS | Assignment |
Owner name: CITICORP INDUSTRIAL CREDIT, INC., 450 MAMARONECK A Free format text: MORTGAGE;ASSIGNORS:MC CULLOCH CORPORATION;MC CULLOCH OVERSEAS N.V.;REEL/FRAME:004158/0190 Effective date: 19830331 Owner name: CITICORP INDUSTRIAL CREDIT, INC., NEW YORK Free format text: MORTGAGE;ASSIGNORS:MC CULLOCH CORPORATION;MC CULLOCH OVERSEAS N.V.;REEL/FRAME:004158/0190 Effective date: 19830331 |
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Owner name: MCCULLOCH CORPORATION, A CORP. OF MD. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITICORP NORTH AMERICA, INC., FORMERLY KNOWN AS CITICORP INDUSTRIAL CREDIT, INC.;REEL/FRAME:005365/0004 Effective date: 19900530 Owner name: FIRST UNION NATIONAL BANK OF NORTH CAROLINA ONE F Free format text: SECURITY INTEREST;ASSIGNOR:MCCULLOCH CORPORATION;REEL/FRAME:005337/0736 Effective date: 19900530 |